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Gunicorn ‘Green Unicorn’ is a Python WSGI HTTP Server for UNIX. The Gunicorn server is broadly compatible with various web frameworks, simply implemented, light on server resources, and fairly speedy.
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Design
Gunicorn is based on the pre-fork worker model. This means that there is a central master process that manages a set of worker processes. The master never knows anything about individual clients. All requests and responses are handled completely by worker processes.
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Sync workers
The most basic and the default worker type is a synchronous worker class that handles a single request at a time. This model is the simplest to reason about as any errors will affect at most a single request.
sync worker does not support persistent connections - each connection is clo...
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Master
The master process is a simple loop that listens for various process signals and reacts accordingly. It manages the list of running workers by listening for signals like TTIN, TTOU, and CHLD. TTIN and TTOU tell the master to increase or decrease the number of running workers. CHLD indicates that ...
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More like this
Why is WSGI necessary?
A traditional web server does not understand or have any way to run Python applications.
Therefore the Python community came up with WSGI as a standard interface that modules and containers could implement. WSGI is now the accepted approach for running Python web applications.
As sho...
Overview
The WSGI has two sides:
- the server/gateway side. This is often running full web server software such as Apache or Nginx.
- the application/framework side. This is a Python callable, supplied by the Python program or framework.
Between the server and the application, t...
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